Onions?

[kosmosEP]

I'm kind of new to the whole "cooking all the time thing" so I look up recipes all the time.  I'm a little confused when recipes call for onions, does it really matter what kind of onions I use or is it just preference?  Which onion has the most nutrition (healthier)?  Or do certain onions compliment certain meat/veggies?

Thanks!

[midnight0300]

I am not the greatest cook in the world but I usually use whichever onion are cheapest unless it calls for something specific.  The exception is red onions - those are a must for salads and roasting with vegetables for me.

[gerrymcd · Accepted solution]

onions are pretty much identical in terms of calories, fibre, etc.  So, its down to personal taste..... I find yellow onions a bit more tangy, and white a bit sweeter.  The red ones are somewhere in between.  

Its worth noting that onions are one of the veggies you don't need to buy organic.  They are very insect/fungi resistant, so farmers use little to no pesticide.